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skl_compute_wrpll: Print the average deviation

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It's interesting to watch the effect of some algorithm tweaks on the
average deviation between the central freq and the dco freq. A metric
we'd like to minimize.

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
This commit is contained in:
Damien Lespiau 2015-06-25 12:17:23 +01:00
parent 06f5f7065f
commit efd2895f23
1 changed files with 10 additions and 0 deletions
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10
tools/skl_compute_wrpll.c
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@ -29,6 +29,8 @@
#include <stdlib.h>
#include <string.h>
#include "igt_stats.h"
#define ARRAY_SIZE(arr) (sizeof(arr)/sizeof(arr[0]))
#define WARN(cond, msg) printf(msg)
@ -844,6 +846,9 @@ static void test_run(struct test_ops *test)
{
unsigned int m;
unsigned p_odd_even[2] = { 0, 0 };
igt_stats_t stats;
igt_stats_init(&stats, ARRAY_SIZE(modes));
for (m = 0; m < ARRAY_SIZE(modes); m++) {
struct skl_wrpll_params params = {};
@ -871,6 +876,8 @@ static void test_run(struct test_ops *test)
diff = abs_diff(dco_freq, central_freq);
deviation = div64_u64(10000 * diff, central_freq);
igt_stats_push(&stats, deviation);
if (dco_freq > central_freq) {
if (deviation > 100)
printf("failed constraint for %dHz "
@ -892,6 +899,9 @@ static void test_run(struct test_ops *test)
}
printf("even/odd dividers: %d/%d\n", p_odd_even[0], p_odd_even[1]);
printf("average deviation: %.2lf\n", igt_stats_get_average(&stats));
igt_stats_fini(&stats);
}
int main(int argc, char **argv)